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United States Patent | 5,072,938 |
Shin | December 17, 1991 |
A game or practice ball is disclosed having a rotation produced by an internal mechanism to cause the ball to curve dramatically when thrown. The ball has a substantially spherical shell. An axle is located diametrically within, and is connected to, the shell. An inertial reference mass in the form of a sphere is located within the shell and is rotatably mounted on the axle. A user released drive means is coupled to the inner sphere and outer shell for rotating the outer shell relative to the inner sphere and portions of the drive so as to impart spin to the shell when the ball is thrown.
Inventors: | Shin; Yong (9322 12th Ave. East, Tacoma, WA 98445) |
Appl. No.: | 432176 |
Filed: | November 6, 1989 |
Current U.S. Class: | 473/613 |
Intern'l Class: | A63B 067/00 |
Field of Search: | 273/60 R,58 R,232,58 F,58 G,65 EC,58 K,26 R,213,DIG. 20,65 EF,65 ED,233 446/431,458,462 |
2078382 | Apr., 1937 | Hanshaw | 273/58. |
2939246 | Jun., 1960 | Glos II | 446/462. |
2949696 | Aug., 1960 | Easterling | 446/462. |
2949697 | Aug., 1960 | Lucitis et al. | 446/458. |
2973800 | Mar., 1961 | Muccino | 273/233. |
3227801 | Jun., 1976 | Ezra | 446/431. |
3453773 | Jul., 1969 | Compton et al. | 446/458. |
3700239 | Oct., 1972 | Patrick | 273/65. |
3874663 | Apr., 1975 | Kahle. |